ABS brakes

PGAMMAGE

CHEVROLET TAHOE

2000 Chevy Tahoe, 76,000 miles, 5.7L engine. The abs system is kicking in on dry pavement with no wheel slippage. Especially happens at the end of a slow braking event, like slowly coming to a stop sign. Doesn't happen every time, maybe every 4th or 5th time. Has happened one time at the beginning of braking while moving slow and almost couldn't stop before reaching the car in front of me. What is happening?